#include<stdio.h>

int main()
{
	int a = 0;
	int b = 0;
	while(1)
	{
		scanf("%d %d", &a, &b);
		if(a == 0 && b == 0)
		{
			break;
		}
		printf("%d\n", a + b);
	}
	
	return 0;
}

